From patchwork Mon Jul 19 08:06:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Billy Tsai X-Patchwork-Id: 12385055 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2C511C12002 for ; Mon, 19 Jul 2021 09:02:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0AFD6611EF for ; Mon, 19 Jul 2021 09:02:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235347AbhGSIVj (ORCPT ); Mon, 19 Jul 2021 04:21:39 -0400 Received: from twspam01.aspeedtech.com ([211.20.114.71]:51414 "EHLO twspam01.aspeedtech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235317AbhGSIVi (ORCPT ); Mon, 19 Jul 2021 04:21:38 -0400 X-Greylist: delayed 709 seconds by postgrey-1.27 at vger.kernel.org; Mon, 19 Jul 2021 04:21:37 EDT Received: from twspam01.aspeedtech.com (localhost [127.0.0.2] (may be forged)) by twspam01.aspeedtech.com with ESMTP id 16J7oVkX015578 for ; Mon, 19 Jul 2021 15:50:31 +0800 (GMT-8) (envelope-from billy_tsai@aspeedtech.com) Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 16J7nQKL015321; Mon, 19 Jul 2021 15:49:26 +0800 (GMT-8) (envelope-from billy_tsai@aspeedtech.com) Received: from BillyTsai-pc.aspeed.com (192.168.2.149) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 19 Jul 2021 16:05:48 +0800 From: Billy Tsai To: , , , , , , , , , , , , CC: Subject: [v1 2/7] dt-bindings: iio: adc: Binding ast2600 adc. Date: Mon, 19 Jul 2021 16:06:02 +0800 Message-ID: <20210719080607.28712-3-billy_tsai@aspeedtech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210719080607.28712-1-billy_tsai@aspeedtech.com> References: <20210719080607.28712-1-billy_tsai@aspeedtech.com> MIME-Version: 1.0 X-Originating-IP: [192.168.2.149] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 16J7nQKL015321 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org This patch add more description about aspeed adc and add vref property for ast2600 to configure it reference voltage. Signed-off-by: Billy Tsai --- .../bindings/iio/adc/aspeed,adc.yaml | 23 +++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/iio/adc/aspeed,adc.yaml b/Documentation/devicetree/bindings/iio/adc/aspeed,adc.yaml index 7f534a933e92..67ff0b5c7ef2 100644 --- a/Documentation/devicetree/bindings/iio/adc/aspeed,adc.yaml +++ b/Documentation/devicetree/bindings/iio/adc/aspeed,adc.yaml @@ -10,14 +10,26 @@ maintainers: - Joel Stanley description: - This device is a 10-bit converter for 16 voltage channels. All inputs are - single ended. + • 10-bits resolution for 16 voltage channels. + At ast2400/ast2500 the device has only one engine with 16 voltage channels. + At ast2600 the device split into two individual engine and each contains 8 voltage channels. + • Channel scanning can be non-continuous. + • Programmable ADC clock frequency. + • Programmable upper and lower bound for each channels. + • Interrupt when larger or less than bounds for each channels. + • Support hysteresis for each channels. + • Buildin a compensating method. + Additional feature at ast2600 + • Internal or External reference voltage. + • Support 2 Internal reference voltage 1.2v or 2.5v. + • Integrate dividing circuit for battery sensing. properties: compatible: enum: - aspeed,ast2400-adc - aspeed,ast2500-adc + - aspeed,ast2600-adc reg: maxItems: 1 @@ -33,6 +45,13 @@ properties: "#io-channel-cells": const: 1 + vref: + minItems: 900 + maxItems: 2700 + default: 2500 + description: + ADC Reference voltage in millivolts (only work at ast2600) + required: - compatible - reg